Fuse-capsule.



IL T. PAISTE.

v FUSE CAPSULE. APPLICATION FILED JUNE 5, 1913. Y'

Patented Sept. 29, 1914.

'a fuse capsule of the general type described shall be relatively inexpensive to make, shall i and Fig. 6 is a vertical section illustrating .body -is closed by a mica or other suitable .whereby the shell 2 isheld in place.` This Ururnn .sTATEs PTENT I onirica.

HENRY T. PAISTE, OF PHILADELPHIA, PENNSYLVANA, ASSGNOR T0 H. T, PAISTE COMPANY, OF'PHILADELPHIA, PENNSYLVANIA, .A CORPORATION OF PENNSYL- Speciication of Letters Patent. v Application led .Tune 5, 1913. ASerial N o. 771,953.

ross-cassent?.

Patented sept. 29, 1914.

To all whom t may concern.'

lBe itvk'novvn that I,`HENRY T. Parere, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements'in Fuse-Capsules, of which the following is a specification.

One object of my invention is to provide and claimed in in application for U. S. Patent 664,157 filed December 6, 1911, which be so constructed as to prevent discoloration of the mica cover of the fuse plug body when the fuseblows, and Which shall have one of its terminal portions disposed in a novel position relatively to the plug body. These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying drawings' in which,

F igure l is a side elevation of a fuse capsule constructed according to my invention; Fig. 2 is a vertical-section of the capsule shown in Fig. l; and 4; are rc spectivcly plan views of the two ends oig the capsule; Fig. 5 isavertical section of a slightly modified form of .the invention,

one feature of my invention as applied to a cartridge fuse.

The capsule constructed according to my invention is designed to be used with or as a. part of a fuse plug whose body isshown in Fig. l. This body has ani annular'form, being made of any suitable insulating material such as porcelain and having mounted within it a brass or other metallic shell 2 which in addition to an Vexternal partl pressed or otherwise formed into screw ti reads, has an internal portion'i ext-end ing Within the tubular cavity of Vsaid body i. These two parts are connected by an annular shoulder portion 5 lying in aplane sulistantially at right angles to the center line of the body 1, and the open end of said transparent plate 6 held in place by an annular anged metal cap 7. Lateral recesses areprovided in the bodyv adjacent its mica covered end, for the reception of tongues S particular fuse plug' body designed toil receive a fuse :capsule in the form of a somewhat elongated hollow porcelain body having a cylindrical-portion or head 9 de# signed to loosely iit Within the threaded portion 3 of the shell 2, and having a sec-` qnd cylindrical portion I0 intewral with the part 9. I cylindrical surfaces of these parts, although in case the fuse plug body should be made in the form shown and described in my application for patcntabove mentioned, this particular shoulder is replaced by the conically formed surface 11'J shown in Fig. 5.

The outer end of the head 9 of the' capsule body is provided with a plate 12- constituting one terminal of the capsule and having A shoulder 1l connects the two connected to it one or more lugs- 13, which as shownin Fig. 2 are expanded or bent outwardly so as to' enga-ge or holdto the end portions of the cavity 14 of the capsule body. To the lug or lugs 13 I solden or.

otherwise electrically, connect a fuse in the" form of a strip or Wire 1.5 of some metal or alloy designed to melt at afpredeterinined temperature, and extend said fuse through; out said cavity, through a notch 16 4formed. in the relatively thin side adjacent the end of the part 10. Thereafter I extend said fuse over the outside cylindrical surface" of 'this part 10, bending it substantially at right angles across the shoulder 11 and carrying its end into a groove 17. iol-med in the side of the head .9 of the capsule. Both the notch 16 andthe'groove `17 are thereafter preferably illed in 'with some hard and relatively .infusible insulatin material such as a'iniX- ture of, plaster of aris and silicate'of soda,

after which a transparent disk 1S of mica or vother suitable materialu is placed over the open end of the cavity 14.A and is held thereon by a flanged ring 19 retained in place by the above mentioned cement-itious material. In -addition to the filled notch 16,.the end oiE the part 10 of the capsule is provided with two or more notches 2O having grooi'ed eontinuations 21 formed in the outside surface of said part, `in order to permit of the escape of air andI hot which may be generated Yuithifi the chamber 11i at the time These notches with their ensions cooperate "with the capfforined by the -fuse Ui mela.

sages whichopen laterally out.of the end of the capsule body, extend longitudinally of the capsule and discharge some distance from the'end thereof.

Under` conditions of use the ca-psule is introduced into the fuse plugbody as shown in Fig. 1 so that the part 15a of the fuse electrically contacts with t-he shoulder portion 5 of the metal shell 2. When this fuse plug body with the capsule is screwed into a out out block, receptacle or other suitable structure, the terminal plate 12 engages the centra-l terminal of said socket while the threaded part 3 of the shell likewise electrically contacts with ghe similarly formed threaded socket shell thus completing a circuit from the plate 12 through the body of the fuse 15 to the part 15a thereof, thence to fthe shouldered part of the shell 2, and from the threaded portion 3 thereof to the threaded part of the socket. In case of the passage of an abnormal current through the.

circuit, the fuse 15 opens the same by melting in the well known manner, though owing to the mica disk 18 upon the end of the part 10 of the capsule, the molten metal or smoke cannot Ibe deposited on the mica coverpiece of the plug body but will be collected upon thecover 18 of the fuse capsule. This latter may be thereafter removed and replaced by another capsule having its fuse intact. l

It Ais to be noted that by providing the notch-16 rather 'than a perforation in the edge ofthe open end Vof the part 10 of the capsule, the expense of manufacture is ma.-

v terially reduced, so that even with the added items of the mica disk 18 and its retaining ring19, the cost of the plug still remains relatively low. I

In that form` of my invention shown in Iig. 6 I-have illustrated a cartridge fuse as equipped withv atransp-arent cover similar to that employed as part of the capsule above described. In this figure, the cylindrical body. 26 of the cartridge fuse is usually made of a suitable length of a tube of insulating material having one vend closed by a metal cap 27 and the opposite end also closed by a transparent disk 18 of mica or other suitable material held in place by a. flanged metal ring 19. In this case the. fuse proper 28 extends between the metal cap 27 and the meta-l ring l9,\bein'g soldered' or otherwise electrically connected to both of ythese members. Under conditions of use, therefore, the flanged c 27 and the ring 19 consti-tute the terminas of the fuse cartridge and electrically engage the terminals of a suitable cut out block -or other' receptacle. Inthis case vas before, the transparent cover plate 18 permits the inspection of the fuse 28 and at the same time prevents the discharge of molten metal when the fuse melts. ,The ring-and cap are held in place by any suitable means, being shown for example, as having indent-ations V29 in their sides whereby a conical projection is forced into the adjacent parts of the liber tube'26.

1. The combination in a fuse capsule of a tubular body of insulating material closed at one end and having two portions of different external diameters; a. tern'iinal plate on one end of said body; a conductor including a relatively fusible portion connected to the terminal .within the body and ex`- tending therefrom over the external surface of said body; with a transparent cap normally closing the open end of said body; and means for holding the cap in place.I

2. The combination in a fuse capsuleV` of a tubular body of insulating material closed at one end and having two portions of different external diameters; a terminal plate on one end of said body; a conductor including a relatively fusible portion connected to the terminal within the body and extending therefrom over the external surface of said body; with a transparent cap normally closing the open end .of said body; and flanged ring cemented to the body for holding the cap in place.

8. The combination in a fuse capsule of -a tubular body of insulating material closed at one end and including two portions of different external diameters, the portion of smalle-r diameter being open at its extremity and having a plurality of notches in its edge; a terminal plate on the end of the body adjacent its large diameter portion; a conductor having a relatively fusible portion and connected to said terminal, extending through the body, through one of the notches` in the edge of the -smaller diameter portion thereof and over vthe external surface of said body; with a cap closing the small diameter end of the body land coperat-ing with certain of the notches therein to form air passages.

4. The combination in a fuse capsule of a hollow body having two portions of different diameters and closed at its portion of large diameter; a terminal plate on the end of the body adjacent said latter portion, the end of the smalldiameter part of the body being provided with notches extended from its edge in its external surface; a conductor having a relatively fusible ortion and extending from the termina plate through the body, through one of said notches and over the external surface of the body;with a cap closing the open end of the body.

5. A fuse capsule consisting of a Ibody of insulating material having an open end rovided with notches in its edge extended ongitudinally of said body 1n the externalA over the outside surface of the body and 'In' testimony whereof, have signed my eopemtng wit-h the notches therein to name to this specification, 1n the presence of form air passages opening laterally out of two subscribing witnesses.

the end of the body, extending longitudi- HENRY T. PAISTE. 5 lnaly ofvsaid body and discharging laterally Vtnesses:

at points distant from the end thereof; With WILLIAM E. BRADLEY,

Jos. H. KLEIN.

a fuse in the body. 

